>1xbtH (H:) observed residues (from ATOM records) rgqiqvilgpmfsgkstelmrrvrrfqiaqykclvikyakdtryalpacllrdvaqealg vavigidegqffpdivefceamanagktvivaaldgtfqrkpfgailnlvplaesvvklt avcmecfreaaytkrlgtekeveviggadkyhsvcrlcyfk